Improvement in stove-pipe drums



BEN. JAMES HOBSON.

Improvement in Stove Pipe Drums. 119, 09 Patented 0m. 3,1871.

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UNITED STAT 1;:

BEN JAMES HOBSON, OF OOVINGTON, KENTUCKY.

IMPROVEMENT IN STOVE-PIPE DRUMS.

Specification forming part of Letters Patent No. 119,609, dated October3, 1871.

To all whom ct may concern:

Be it known that I, BEN JAMES HOBSON, of Oovington, in the county ofKenton and State of Kentucky, have invented a new and useful Improvementin Apparatus for Utilizing VVaste- Heat; and I do hereby declare thatthe following is a full, clear, and exact description thereof, whichwill enable others skilled in the art to make and use the same,reference being had to the accompanying drawing forming a part of thisspecification, in which-- The figure is a sectional elevation.

My invention is an improvement in the class of air-heatin g drumsdesigned for connection with stoves, furnaces, 860.,11I1Cl61 anysuitable or convenient local arrangement, for the purpose of utilizingthe heat of the same by causing it to be imparted or radiated to thesurrounding air. It is manifest that to attain this result in the bestmanner or by the best means the device or apparatus employed must bedistinguished, viz., first, by simplicity of construction and consequentcheapness in manufacture; second, by maximum amount or area of radiatingsurface combined with minimum weight and utmost compactness inarrangement of parts; and third, by facility of admission and exit, anduninterrupted passage of air and products of combustion. It is in theserespects that I claim my invention is pro-eminently an improvement overothers, more especially that of W. Duryea and W. Ennis, patented April30, 1867, N 0. 64,293. In that apparatus neither the air nor theproducts of combustion are enabled to pursue their natural upward courseuninterrupted, but are each deflected downward immediately on enteringthe drum, the one by vertical transverse partitions, the other bytubular supplementary receivers or drums, arranged at the ends of themain drum or case, and connected at the bottom by a horizontal pipe. Thesaid partitions subserve little or no useful purpose, since they serveto prolong the contact of the air with no heated portion of the drum andinevitably absorb caloric to a degree proportional to their thicknessand superficial area. The external superficial area of the two innerdrums is also wholly disproportionate to their length and width, so thatthey fail to utilize or radiate the heat contained in the products ofcombustion on their passage through them. Again, the alternatelyupward-and-downward course of the air and products of combustion retardstheir passage through the apparatus unnecessarily, thus entailing manydisadvantages in its practical operation. My invention remedies theseand other defects of such construction by an arrangement of entrance andexit-fines and radiating tubes, which I will now proceed to describe.

Referring to the drawing, a is a cylindrical drum, of any convenientsize, having closed ends, within which is placed a longitudinal systemof pipes, 1), opening at their ends into short drums, c d, standingcrosswise within the larger drum. An elbow, 0, opening into the outerend of the drum 0, extends downward through the drum a, and is intendedto be connected with the escapeflue of a stove, furnace, or the like,through which elbow the products of combustion escape from the stove,passing into and through the drum 0, pipes b, and drum 0, from whichlatter the smoke and gases escape through an elbow, f, extending upwardfrom the drum (1, passing through the drum a, and opening into achimney. A pipe, g, opens into the drum to under the elbowf, throughwhich pipe cold air enters the drum. Coming in contact first with thedrum d, whose temperature is necessarily the lowest of any part of theinterior arrangements of the drum a, the current of cold air absorbsheat from said drinn d. If the current striking the drum d were as hotas the latter, or hotter, it would not absorb heat from it; but, bycausing the external current to strike the drum d first, when saidexternal current is colder than the drum d, I effect the absorption ofthe heat of the latter. As the external current circulates among thepipes b it becomes gradually hotter, but it is all the time coming incontact with surfaces hotter than itself, as the temperature of thepipes 12 increases directly as the distance from the drum d.Consequently the external current is constantly receptive of heat duringits passage through the drum or in the opposite direction to that of theproducts of combustion. The external current escapes through the pipe h,and can be conducted thence to be utilized for any desired purpose. I11this manner, by the time the products of comlmstion reach the elbow fthey are supposed to have parted with the greater portion, if not all,of their heat.

What I claim as new, and desire to protect by Letters Patent, is

The improved air-heating apparatus herein described, formed of thecylinder a, provided with air-entrance and exit-pipes g and h, locatedas specified, the series of horizontal tubes 1) and connected verticalcylindrical drums 0 and d, and the pipes or elbows e and f, allconstructed and arranged as and for the purpose described.

B. J. HOBSON.

Witnesses:

'lrros. D. D. OURAND,

SOLON O. KEMON. (105)

